Intestinal Parasites of the Dog. 305 



corpus calosum the sheep elevates its nose and advances straight 

 forward until arrested by some obstacle. If lodged in the cere- 

 bellum it causes elevation of the head, sudden jerking upward of 

 the limbs, planting them with a hesitating uncertain motion, 

 great nervousness, and sometimes a stumbling run, followed by a 

 fall, and violent ineffectual struggles to get up. Blindness is 

 usually present, but especially so, if there is pressure on the op- 

 tic thalamus, corpus striatum or corpora quadrigemini. If the 

 cyst is located in the upper part of the spinal cord there is motor 

 paralysis on the same side of the body and sensory paralysis on 

 the opposite side, behind the hydatid. There may be palsy of 

 both hind limbs, rectum, bladder and tail. Sometimes there is 

 intense itching along the spine. 



In all cases there is a hesitancy and uncertainty of movement. 

 The remissions serve to distinguish the affection from paresis or 

 cerebral disorder due to a single tumor like a cholesteatoma or 

 psammoma. 



If left to itself the patient neglects to eat and by the combined 

 starvation and constant movement it rapidly wastes and dies in 

 marasmus. If well fed and cared for it may sometimes gain 

 flesh. 



The coenurus usually affects lambs, and rarely sheep of over 

 two years old, or those that are strong, vigorous and well condi- 

 tioned. The young, thin, weak and starved are the main vic- 

 tims. For the same reason those on poor, damp, exposed ground 

 suffer more than those on rich, dry, sheltered pasture. 



Exceptionally in old standing cases, with the hydatid near the 

 surface of the hemisphere, the cranial bone is absorbed and a soft 

 spot may be felt indiqating the seat of the parasite. 



Prevention. Destroy superfluous dogs. Deny to dosg all 

 parts of the body of the sheep which has suffered from this dis- 

 ease. The sheep heads especially must be boiled, rendered, 

 burned or deeply buried. Never allow them to be thrown, raw, 

 where dogs, foxes or wolves can find them. Let necessary dogs 

 be frequently examined and all tapeworms expelled by vermi- 

 fuges. Allow no untreated dogs on the pasturages of young 

 sheep, nor about the sources of their water supply. Keep all 

 young sheep in a constantly thriving condition. If any have 

 shown the early symptoms of cerebral congestion and have sur- 

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